import java.math.BigDecimal;
import java.util.Scanner;

import static java.lang.Math.abs;

/**
 * Created with IDEA
 * author:ju bai
 * Date:2021/5/19
 * Time:11:06
 **/
public class Main2 {
    /**
     * 每日一题-判断是否能组成三角形
     * 任意两边的和要大于第三边，任意两边的差要小于第三边
     *
     * @param args
     */
    public static void main1(String[] args) {
        Scanner sc = new Scanner(System.in);
        while (sc.hasNext()) {
            double a = sc.nextDouble();
            double b = sc.nextDouble();
            double c = sc.nextDouble();
            if (a + b > c && a + c > b && b + c > a ) {
                //abs(a - b) < c && abs(a - c) < b && abs(b - c) < a
                System.out.println("Yes");
            } else {
                System.out.println("No");
            }
        }
    }

    //使用BigDecimal
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        while (sc.hasNext()) {
            BigDecimal a = sc.nextBigDecimal();
            BigDecimal b = sc.nextBigDecimal();
            BigDecimal c = sc.nextBigDecimal();
            if (a.add(b).compareTo(c)>0&&a.add(c).compareTo(b)>0&&b.add(c).compareTo(a)>0){
                System.out.println("Yes");
            }else {
                System.out.println("No");
            }
        }
    }
}
